Fixed diffuser vanes assembly for guiding flow through a turbomachine, comprising an internal platform with inbuilt reinforcements, and associated turbomachine and production method

Abstract

The invention relates to a fixed diffuser vanes assembly (10) for guiding flow through a turbomachine, comprising an internal annular platform (12) and a plurality of fixed vanes (11) which are mounted on this platform, the internal platform comprising a support plate (121) forming the base of said vanes, a radial annular partition (120) extending from the support plate toward an axis of the vanes assembly, and an internal ring (122) attached to the radial annular partition and having an internal surface on which an abradable material (123) is arranged, the vanes assembly being characterized in that the internal ring comprises at least one cut-out (1223) delimiting a tongue (1226), the tongue being bent to press against the radial annular partition (120). The invention also relates to a method of manufacturing such a vanes assembly and to a turbomachine incorporating such vanes.

The invention claimed is: 
     
       1. A fixed vane assembly for distributing flow within a turbomachine, including an inner annular platform and a plurality of fixed vanes mounted thereon, the inner annular platform including a support plate forming the base of said vanes, an annular radial partition extending from the support plate toward an axis of the vane assembly, and an inner ring applied to the radial partition and having an inner surface on which is positioned an abradable material,
 wherein the inner ring includes at least one cut delimiting a tongue, the tongue being folded to bear against the radial partition. 
 
     
     
       2. The vane assembly according to  claim 1 , wherein the tongue bears, with at least one end portion, on the radial partition. 
     
     
       3. The vane assembly according to  claim 2 , wherein the at least one end portion is brazed onto the radial partition. 
     
     
       4. The vane assembly according to  claim 1 , wherein the inner ring is applied to the radial partition at through openings each resulting from folding the corresponding tongue. 
     
     
       5. The vane assembly according to  claim 4 , wherein the abradable material is applied to the radial partition through each opening. 
     
     
       6. The vane assembly according to  claim 4 , wherein the abradable material is brazed to the inner surface of the ring and to the radial partition through each opening of the ring. 
     
     
       7. The vane assembly according to  claim 1 , wherein the inner ring further includes an annular tab extending upstream and an annular tab extending downstream with respect to an air flow in the vane assembly. 
     
     
       8. A turbomachine including at least one fixed vane assembly for distributing flow according to  claim 1 . 
     
     
       9. A method for manufacturing a fixed vane assembly for distributing flow according to  claim 1 , including the steps of:
 forming at said least one cut in said inner ring to delimit said tongue, 
 folding one portion of the tongue with respect to the inner ring, and 
 attaching the inner ring to the radial partition of the inner annular platform of vane assembly, so that the radial partition is in contact with an outer annular surface of the inner ring, and the portion of the tongue with respect to the ring bears on said partition. 
 
     
     
       10. The method for manufacturing a vane assembly according to  claim 9 , wherein attaching the inner ring to the radial partition includes brazing the portion of the tongue with respect to the inner ring onto the partition. 
     
     
       11. The method for manufacturing a vane assembly according to  claim 9 , further including brazing a layer of abradable material onto the inner surface of the ring, and onto the radial partition through a plurality of openings of the inner ring resulting from the folding of the tongue.